The Armagh Observatory is the oldest scientic institution in Northern Ireland, the longest continuously operating astronomical research institute in the UK and Ireland. There is a uctuating population of approximately 30 academic sta , which at the end of 2011 comprised 6 Research Astronomers and 24 other academic sta (including the director, several PDRAs and around a dozen PhD students) as well as several academic visitors, 2 core research and core grounds and administrative support sta . The Observatory has an active visitors programme, each year hosting between 10 and 20 temporary academic visitors from abroad, people who visit Armagh for periods of typically a day or.